JP6144563B2 - Detector - Google Patents

Description

  The present invention relates to a detector, and more particularly to a detector that can stably use the displacement of a pendulum supported by a cross spring.

  Conventionally, an inclination detector for measuring a minute inclination such as an inclination of a crust due to an earthquake or the like as shown in Patent Document 1 is known. Such a tilt detector includes a pendulum, a cylindrical cross spring 10 (for example, shown in FIG. 5) that rotatably supports the pendulum, and a support member 22 that holds and fixes the cross spring 10. The inclination detector obtains (outputs) the inclination from the displacement of the pendulum. Here, the cross spring 10 is held and fixed to the support member 22. The support member 22 is provided with a through-hole into which the cross spring 10 can be fitted, and a slit S is formed from the through-hole toward the radially outer side. Then, the portions of the support member 22 separated by the slit S are brought close to each other by screwing of the screws 34, whereby the cross spring 10 is sandwiched between the through holes of the support member 22, and the cross spring 10 is held and fixed by the support member 22. I am doing so. In addition, since the cross spring 10 has an extremely small friction loss and a small axial run as a rotation support member, even a very small displacement of the pendulum can be an effective output.

JP 2001-33242 A

  However, in the method of holding and fixing the cross spring 10 shown in FIG. 5, a uniform force cannot be exerted on the entire circumference of the cylindrical cross spring 10, and in the case of FIG. It will be unevenly distributed. For this reason, in the method shown in FIG. 5, since the uneven internal stress is accumulated in the cross spring 10 when held and fixed to the support member 22, the internal stress is gradually released from the cross spring 10 over time. Or the internal stress may be instantaneously released by some external force. That is, the displacement of the pendulum supported by the cross spring 10 may drift or be offset, which may cause the output of the tilt detector to become unstable.

  The present invention has been made to solve the above problems, and an object thereof is to provide a detector that can stably use the displacement of a pendulum supported by a cross spring.

The invention according to claim 1 of the present application provides a detector including a pendulum, a cylindrical cross spring that rotatably supports the pendulum, and a support member that holds and fixes the cross spring. Each of the pendulums includes a tapered opening whose inner diameter is enlarged or reduced in the axial direction of the cross spring, and a first tapered outer surface that can be fitted to the tapered opening is provided on one end side, and the cross in the axial direction. An inner surface parallel to the outer surface of the spring; and a ring member that is fitted onto the cross spring. The movement of the ring member in the axial direction causes the cross spring to pass through the ring member to support the support member and A second taper outer surface that is held and fixed to the pendulum and whose outer diameter is enlarged from the other end side is provided on the other end side of the ring member, and is arranged at equal intervals in the circumferential direction of the taper opening. And The support member or the pendulum is provided with a plurality of screws that are screwed from a direction orthogonal to the axial direction, and the tip end portions of the plurality of screws press the second tapered outer surface, thereby causing the ring member to move in the axial direction. The above-mentioned problem is solved by moving to .

In the invention according to claim 2 of the present application, the distal end portions of the plurality of screws and the outer surface of the second taper are hardened.

  According to the present invention, the displacement of the pendulum supported by the cross spring can be stably used.

The schematic diagram which shows an example of the inclination detector which concerns on embodiment of this invention Schematic diagram showing an example of the shaft support mechanism of FIG. 1 (side sectional view (A), front view (B)) Schematic diagram of the vicinity of the cross spring in FIG. Schematic diagram showing the configuration of the cross spring of FIG. 1 (perspective sectional view (A), front view (B)) Schematic diagram showing means for holding and fixing the cross spring in the conventional shaft support mechanism

  Hereinafter, modes (hereinafter referred to as embodiments) for suitably carrying out the present invention will be described in detail. The present invention is not limited to the contents described in the following embodiments and examples. In addition, constituent elements in the embodiments and examples described below include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in a so-called equivalent range. Furthermore, the constituent elements disclosed in the embodiments and examples described below may be appropriately combined or may be appropriately selected and used.

  An embodiment according to the present invention will be described with reference to FIGS.

  First, the overall configuration of the inclination detector 100 according to the present embodiment will be schematically described.

  As shown in FIG. 1, the inclination detector (detector) 100 includes a detector main body 102, a control unit 104, and an inclination measurement unit 106. This inclination detector 100 is assumed to be installed in a place to be measured and used without maintenance for a long period (yearly unit), for example.

  As shown in FIG. 1 or 4, the detector main body 102 houses a shaft support mechanism 120 and a pendulum 130 inside a casing 108. An inner upper end 108A of the casing 108 rotatably supports the shaft support mechanism 120 via a single cross spring 110. The shaft support mechanism 120 supports the pendulum 130 through the other cross spring 110 so as to be rotatable. That is, the two cross springs 110 are arranged so that the axial directions O are orthogonal to each other. The pendulum 130 is provided at a position on a perpendicular line perpendicular to the axial direction O of the two cross springs 110. The shaft support mechanism 120 will be described later.

  As shown in FIG. 1, the pendulum 130 is provided with magnetic circuit portions on both sides thereof, and further has a capacitance detection portion (movable side) 140 at the lower end thereof. The magnetic circuit unit includes a magnet (not shown), and two opposing magnetic poles 136 and a pole piece 138 form a left and right two-stage magnetic circuit. The counter electrode 136 and the pole piece 138 are made of a magnetic material having a high magnetic permeability. Members other than the magnetic circuit unit that constitute the detector body 102 are made of a nonmagnetic material. Between the opposing magnetic pole 136 and the pole piece 138, electromagnetic coils 142 projecting from the inner wall of the casing 108 are respectively disposed. The electromagnetic coil 142 and the counter magnetic pole 136 constitute a force motor that can correct the displacement of the pendulum 130.

  As shown in FIG. 1, the capacitance detection unit (movable side) 140 is provided at the lower end portion of the pendulum 130 and is disposed to face the capacitance detection unit (fixed side) 144. The capacitance detection unit (fixed side) 144 is supported by the casing 108. The capacitance detection unit (movable side) 140 and the capacitance detection unit (fixed side) 144 constitute a displacement detection capacitor C. Depending on the change in the capacitance of the capacitor C, the left and right sides of the pendulum 130 are changed. In addition, forward and backward displacement is detected.

  As shown in FIG. 1, the control unit 104 is connected to the electromagnetic coil 142. The force motor is controlled by supplying a feedback current.

  As shown in FIG. 1, the tilt measuring unit 106 is connected to the control unit 104, and is configured to obtain the tilt of the detector main body 102 based on a feedback current passed through the electromagnetic coil 142.

  Next, the cross spring 110 will be briefly described with reference to FIGS.

  The cross spring 110 is already disclosed in US Pat. No. 3,807,029, for example. The cross spring 110 mainly has a two-layer cylindrical member and two leaf springs 118A and 118B arranged inside thereof.

  As shown in FIG. 4A, the outer cylindrical member 111 disposed on the radially outer side of the two layers of cylindrical members has a movable ring 116 and fixed rings 112 and 114. The fixed rings 112 and 114 are arranged side by side with the movable ring 116 via a predetermined gap P in the axial direction O so as to sandwich the movable ring 116. That is, the rings 112, 114, 116 are not in contact with each other in the axial direction O. In the present embodiment, the outer cylindrical member 111 has a diameter of about 1 cm and a gap P of 1 mm or less.

  On the radially inner side of the outer cylindrical member 111, as shown in FIG. 4B, two arc members 117A and 117B are arranged as the inner cylindrical member 117. Both the arc members 117A and 117B have an arc shape with an arc angle α (for example, 90 degrees <α <180 degrees) in a cross section orthogonal to the axial direction O, and extend from the fixed ring 112 to the fixed ring 114 in the axial direction O. It has been the length. The arc members 117 </ b> A and 117 </ b> B are arranged to face each other inside the outer cylindrical member 111. The arc member 117A is integrated with the movable ring 116, and the arc member 117B is integrated with the fixed rings 112 and 114. A gap G is provided in the radial direction between the arc member 117 </ b> A and the fixing rings 112 and 114, and a gap G is provided in the radial direction between the arc member 117 </ b> B and the movable ring 116.

  As shown in FIGS. 4 (A) and 4 (B), two leaf springs 118A and 118B in a state of intersecting at an axis O so as to form a cross shape are integrated with the two arc members 117A and 117B, respectively. ing. The leaf spring 118A is provided with an opening 118AB through which the leaf spring 118B penetrates, and the leaf springs 118A and 118B are not in contact with each other. For this reason, since the leaf springs 118A and 118B are bent about the axis O, the movable ring 116 can be rotated relative to the fixed rings 112 and 114 without frictional sliding. The movable ring 116 can be rotated with respect to the fixed rings 112 and 114 until the end portions 117AA and 117BA of the two arc members 117A and 117B come into contact with each other.

  In other words, while the shaft support mechanism 120 is compactly configured, the cross spring 110 can stably reproduce a minute amount of rotation, and even an extremely minute displacement of the pendulum 130 can be an effective output. .

  In other words, when a force is locally applied to the outer cylindrical member 111, the two leaf springs 118A and 118B are locally bent and plastically deformed, or between two layers of cylindrical members. The gaps G disappear and contact each other. For this reason, in order to maximize the above-described function of the cross spring 110, in the present embodiment, the outer cylindrical member 111 (the fixed rings 112 and 114 and the movable ring 116) has an entire circumference and is axial. The cross spring 110 is held and fixed by applying a uniform force to all the lengths of O.

  Next, the shaft support mechanism 120 that supports the cross spring 110 will be described with reference to FIGS. 2A, 2B, and 3. FIG.

  2A and 3, the shaft support mechanism 120 includes a cross spring 110 and two support members 122 and 126 that support the pendulum 130 via the cross spring 110. The cross spring 110 rotatably supports the pendulum 130. The support members 122 and 126 hold and fix the cross spring 110.

  As shown in FIG. 3, each of the support members 122 and 126 and the pendulum 130 includes tapered openings 122A, 126A, and 130A having tapered shapes in which the inner diameter monotonously increases or decreases in the axial direction O of the cross spring 110. In the pendulum 130, three female screw portions 130B are formed from the direction orthogonal to the axial direction O at equal intervals in the circumferential direction of the tapered opening portion 130A. For this reason, the three screws 134 provided with the male screw part 134B on the outer periphery are respectively screwed into the three female screw parts 130B, so that the three screws 134 are equally spaced from each other in the circumferential direction of the tapered opening 130A. (In this embodiment, since the number of the screws 134 is three, the screws 134 are arranged at intervals of 120 degrees as shown in FIG. 2B). In addition, by adjusting the screwing amount of the screw 134, it is possible to adjust the amount of penetration (pushing amount) of the tip 134A of the screw 134 into the tapered opening 130A. Corresponding to the tapered openings 122A, 126A, and 130A, ring members 124, 128, and 132 are disposed between the tapered openings 122A, 126A, and 130A and the outer surfaces 112A, 114A, and 116A of the cross spring 110, respectively. .

  As shown in FIG. 3, the ring members 124, 128, and 132 are wedge-shaped in cross section, and the outer surfaces 124 </ b> A, 128 </ b> A, and 132 </ b> A are tapered first tapered outer surfaces whose outer diameter monotonously increases from one end side. Yes. That is, the ring members 124, 128, and 132 have first tapered outer surfaces 124 A, 128 A, and 132 A that can be fitted to the tapered openings 122 A, 126 A, and 130 A, respectively, on one end side, and the outer surface 112 A of the cross spring 110 in the axial direction O. It has inner surfaces 124B, 128B, 132B parallel to 114A, 116A. The ring members 124, 128, and 132 are fitted on the cross spring 110 by contacting the outer surfaces 112A, 114A, and 116A of the cross spring 110 with their inner surfaces 124B, 128B, and 132B. Here, the first tapered outer surfaces 124A, 128A, and 132A that are “compatible” with the tapered openings 122A, 126A, and 130A, respectively, are tapered openings with respect to the outer surfaces 112A, 114A, and 116A (parallel to the axial direction O) of the cross spring 110. That is, the inclination angles θ1, θ2, and θ3 of the portions 122A, 126A, and 130A and the inclination angles of the first tapered outer surfaces 124A, 128A, and 132A are substantially the same.

  As shown in FIG. 3, the ring member 132 is provided with a second tapered outer surface 132 </ b> C whose outer diameter monotonously increases from the other end side on the other end side. For this reason, the tip end portion 134A of the screw 134 that is screwed into the female screw portion 130B of the pendulum 130 can press the second tapered outer surface 132C. Here, the inclination angle β of the distal end portion 134A of the screw 134 with respect to the outer surface 116A is substantially the same as the inclination angle θ4 of the second tapered outer surface 132C (β≈θ4). For this reason, when the second tapered outer surface 132C is pushed in by the tip end portion 134A of the screw 134, they are continuously in line contact with each other (that is, even if the ring member 132 moves in the axial direction O). .

  The end portions 134A and the second tapered outer surfaces 132C of the plurality of screws 134 are subjected to a curing process by heat treatment (the curing process is not limited to the heat treatment, and may be realized by coating or the like). In FIG. 3, the tip 134A of the screw 134 is depicted as a trapezoid with a corner. However, the lower end of the tip 134A is actually a curved surface with a corner (not limited to this, The part 134A itself may be spherical. The support member 122 (126), the pendulum 130, the ring member 124 (128, 132), and the screw 134 are all made of a nonmagnetic material having the same linear expansion length coefficient such as brass.

  Next, a procedure for holding and fixing the cross spring 110 will be described below mainly based on FIG.

  In order to hold and fix the cross spring 110 to the support members 122, 126 and the pendulum 130 via the ring members 124, 128, 132, it is realized by moving the ring members 124, 128, 132 in the axial direction O. Can do. That is, in the case of the support member 122, the ring member 124 in which the cross spring 110 is fitted to the support member 122 is moved to the right in the axial direction O. That is, the first taper outer surface 124A is brought into contact with the taper opening 122A, and the first taper outer surface 124A is pushed into the taper opening 122A. At this time, the inner surface 124B of the ring member 124 is parallel to the outer surface 112A of the cross spring 110. For this reason, the inner surface 124B of the ring member 124 remains parallel to the outer surface 112A of the cross spring 110 by pushing the first tapered outer surface 124A into the tapered opening 122A, and the ring member 124 is moved radially inward. It can be shrunk uniformly. That is, a uniform force can be applied to the entire length of the outer surface 112A of the cross spring 110 (fixing ring 112) and the length in the axial direction O with which the ring member 124 is fitted. The same can be done with the pendulum 130 and the support member 122.

  In the support member 122, in order to push the first tapered outer surface 124A into the taper opening 122A, the ring-shaped jig is directly pressed against the ring member 124 from the axial direction O, and the jig is axially moved. It can be easily realized by moving to O (the support member 126 is also the same). In the case of the pendulum 130, the three screws 134 are screwed into the female screw portion 130 </ b> B of the pendulum 130, and the second tapered outer surface 132 </ b> C of the ring member 132 is pressed by the tip portion 134 </ b> A of the screw 134. It can be pushed inside the tapered opening 130A. Specifically, an appropriate amount of the three screws 134 are screwed in order, and the ring member 132 is moved by an appropriate distance so that the ring member 132 does not tilt. Finally, the ring member 132 is moved so that the cross spring 110 (the movable ring 116) is held and fixed to the pendulum 130 with an appropriate holding force, and substantially the same force is applied to the distal end portions 134A of the three screws 134. The amount of screwing of the three screws 134 is adjusted so as to be applied. That is, by using the screw 134 for the movement of the ring member 132, the holding and fixing of the cross spring 110 to the pendulum 130 positioned between the support members 122 and 126 that do not have a work space in the axial direction O can be stabilized. (The method of holding and fixing the cross spring 110 with respect to the pendulum 130 may also be applied to the support members 122 and 126. In this case, the operation in the axial direction O with respect to the holding and fixing of the cross spring 110 is possible. Space can be saved, and the application target of the cross spring 110 can be increased).

  It is also conceivable that the cross spring 110 is directly held and fixed to the support members 122, 126 and the pendulum 130 with an adhesive without using the ring members 124, 128, 132. However, in that case, there is a possibility that the turning function of the cross spring 110 is impaired by the wraparound of the adhesive into the gap P of the cross spring 110. Further, when the adhesive is hardened, there is a possibility that internal stress unevenly distributed in the cross spring 110 is generated due to local sink of the adhesive. Further, since the openings of the support members 122 and 126 and the pendulum 130 for holding and fixing the cross spring 110 need to be larger than the outer diameter of the cross spring 110, the support members 122 and 126 and the pendulum 130 are arranged in the axial direction. There is also a possibility that it is held and fixed in a state inclined from O, and there is also a possibility that the axis of the support members 122 and 126 and the pendulum 130 and the axis of the cross spring 110 are displaced.

  On the other hand, in the present embodiment, the ring members 124, 128, 132 are uniformly contracted radially inward, so that the entire length of the cross spring 110 and in the axial direction O (the ring member 124). , 128 and 132), and the cross spring 110 is held and fixed to the support members 122 and 126 and the pendulum 130. For this reason, the function of the cross spring 110 described above can be maximized. That is, the support members 122 and 126 and the pendulum 130 are not easily tilted from the axial direction O, and the axes of the support members 122 and 126 and the pendulum 130 and the axis O of the cross spring 110 can be easily aligned with high accuracy. Of course, since the internal stress is not unevenly distributed, it is possible to prevent the pendulum 130 from drifting or offset. It should be noted that the adhesive can be used to prevent the locking of the ring members 124, 128, 132 with respect to the support members 122, 126 and the pendulum 130 (fixation).

  In the present embodiment, the second tapered outer surface 132C is also provided on the other end side of the ring member 132, and three screws 134 are provided, and the distal ends 134A of the three screws 134 are the second tapered outer surface 132C. , The ring member 132 is moved in the axial direction O. For this reason, even if the pendulum 130 is disposed between the support members 122 and 126 at a narrow interval P in the axial direction O, there is no need to provide a working space in the axial direction O, and a ring is formed in the tapered opening 130A of the pendulum 130. The member 132 can be pushed in reliably. Note that the number of screws 134 is not limited to three and may be two or more. However, the larger the number of screws 134, the more stable movement of the ring member 132 can be realized. Of course, in the pendulum, the cross member may be held and fixed to the pendulum by moving the ring member without using a screw.

  In the present embodiment, the distal end portion 134A and the second tapered outer surface 132C of the three screws 134 are cured. For this reason, it is hard to make a dent in the 2nd taper outer surface 132C with the screw 134, and the ring member 132 can be moved with the screw 134 more stably. Of course, it is not always necessary to subject the tip of the screw and the outer surface of the second taper to hardening.

  In the present embodiment, the support member 122 (126), the pendulum 130, the ring member 124 (128, 132), and the screw 134 are all made of the same nonmagnetic material and have the same linear expansion coefficient. For this reason, it is possible to prevent the uneven internal stress from being generated in the cross spring 110 even under a high temperature environment. At the same time, since the cross spring 110 is not held and fixed to the support members 122 and 126 and the pendulum 130 via different materials such as fluid and resin, it is easy to predict the change with time and the durability is also long-term. can do. For this reason, it becomes possible to realize maintenance-free over a long period of time.

  In the present embodiment, the inclination angle β of the tip end portion 134A of the screw 134 is substantially the same as the inclination angle θ4 of the second tapered outer surface 132C (β≈θ4). That is, since the tip 134A of the screw 134 and the second taper outer surface 132C are in line contact, the second taper outer surface 132C is hardly deformed, and the ring member 132 can be moved stably.

  That is, in the present embodiment, the displacement of the pendulum 130 supported by the cross spring 110 can be stably used.

  In the above embodiment, brass is mainly assumed as a nonmagnetic material. However, the present invention is not limited to this, and aluminum, copper (including copper alloys such as phosphor bronze), and nonmagnetic stainless steel are not limited thereto. Etc.

  Moreover, in the said embodiment, although the inclination detector was applied as a detector applied, this invention is not limited to this. For example, the applied detector may be a servo-type speed detector or a servo-type acceleration detector.

  The present invention can be widely applied to detectors having a pendulum, a cylindrical cross spring that rotatably supports the pendulum, and a support member that holds and fixes the cross spring.

DESCRIPTION OF SYMBOLS 10, 110 ... Cross spring 22, 122, 126 ... Support member 34, 134 ... Screw 100 ... Inclination detector 102 ... Detector main body 104 ... Control part 106 ... Inclination measuring part 108 ... Casing 111 ... Outer cylindrical member 112, 114 ... Fixed ring 116: movable ring 117 ... inner cylindrical member 117A, 117B ... arc member 118A, 118B ... leaf spring 120 ... shaft support mechanism 122A, 126A, 130A ... taper opening 124, 128, 132 ... ring member 124A, 128A, 132A ... First taper outer surface 124B, 128B, 132B ... Inner surface 130 ... Pendulum 132C ... Second taper outer surface 136 ... Counter magnetic pole 138 ... Pole piece 140 ... Capacitance detector (movable side)
142: Electromagnetic coil 144: Capacitance detector (fixed side)

Claims (2)

In a detector having a pendulum, a cylindrical cross spring that rotatably supports the pendulum, and a support member that holds and fixes the cross spring.
Each of the support member and the pendulum includes a tapered opening whose inner diameter is enlarged or reduced in the axial direction of the cross spring,
A first taper outer surface that can be fitted to each of the tapered openings is provided on one end side, has an inner surface parallel to the outer surface of the cross spring in the axial direction, and has a ring member that fits over the cross spring;
Due to the movement of the ring member in the axial direction, the cross spring is held and fixed to the support member and the pendulum via the ring member,
A second taper outer surface whose outer diameter is enlarged from the other end side is also provided on the other end side of the ring member,
A plurality of screws that are arranged at equal intervals in the circumferential direction of the tapered opening and that are screwed to the support member or the pendulum from a direction orthogonal to the axial direction,
By tip of said plurality of screw presses the second tapered outer surface, you and moving the ring member in the axial direction search can. 2. The detector according to claim 1 , wherein a hardening process is applied to tip portions of the plurality of screws and the second taper outer surface.

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